Scenario:
Daemon is ungracefully shutdown and leaves plugins running (no
live-restore).
Daemon comes back up.
The next time a container tries to use that plugin it will cause a
daemon panic because the plugin client is not set.
This fixes that by ensuring that the plugin does get shutdown.
Note, I do not think there would be any harm in just re-attaching to the
running plugin instead of shutting it down, however historically we shut
down plugins and containers when live-restore is not enabled.
[kir@: consolidate code to deleteTaskAndContainer, a few minor nits]
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This reverts commit 0c2821d6f2.
Due to other changes this is no longer needed and resolves some other
issues with plugins.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This prevents mounts in the plugins dir from leaking into other
namespaces which can prevent removal (`device or resource busy`),
particularly on older kernels.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
v2/Plugin struct had fields that were
- purely used by the manager.
- unsafely exposed without proper locking.
This change fixes this, by moving relevant fields to the manager as well
as making remaining fields as private and providing proper accessors for
them.
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
Split plugin package into `store` and `v2/plugin`. Now the functionality
is clearly delineated:
- Manager: Manages the global state of the plugin sub-system.
- PluginStore: Manages a collection of plugins (in memory and on-disk)
- Plugin: Manages the single plugin unit.
This also facilitates splitting the global PluginManager lock into:
- PluginManager lock to protect global states.
- PluginStore lock to protect store states.
- Plugin lock to protect individual plugin states.
Importing "github.com/docker/docker/plugin/store" will provide access
to plugins and has lesser dependencies when compared to importing the
original monolithic `plugin package`.
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
This ensures that:
- The in-memory plugin store is populated with all the plugins
- Plugins which were active before daemon restart are active after.
This utilizes the liverestore feature when available, otherwise it
manually starts the plugin.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This patch introduces a new experimental engine-level plugin management
with a new API and command line. Plugins can be distributed via a Docker
registry, and their lifecycle is managed by the engine.
This makes plugins a first-class construct.
For more background, have a look at issue #20363.
Documentation is in a separate commit. If you want to understand how the
new plugin system works, you can start by reading the documentation.
Note: backwards compatibility with existing plugins is maintained,
albeit they won't benefit from the advantages of the new system.
Signed-off-by: Tibor Vass <tibor@docker.com>
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
